I'm in BC Canada .....while we can't modify a motorcycle on the otherhand I think it is the only place in North America that still allows people to legally change (with engineer and mechanical inspections) the GVWR of a vehicle.
Many US states, Idaho included, the registered/licensed max weight holds more weight than GVWR, by a long shot.
So changing GVWR really isn't a concern. You simply register the vehicle appropriately. But it is only sub-rating as far as I know, nothing above GVWR.
Many businesses sub-rate trucks, say, register a 30k truck for 25,999 to allow anyone to drive it (no CDL required)